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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	$ 1,737	$ 1,184
Allowance for loan losses, Collectively evaluated for impairment	12,639	12,807
Allowance for loan losses, Modified in a troubled debt restructuring	2,170	2,339
Acquired with deteriorated credit quality	16,546	16,330	$ 16,738	$ 16,737
Loans:
Loans individually evaluated for impairment	6,857	6,951
Loans collectively evaluated for impairment	1,892,003	1,856,452
Acquired with deteriorated credit quality	1,171,391	1,142,626
Loans modified in a troubled debt restructuring	11,596	11,831
Total ending loans balance	1,912,175	1,876,966
Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	1,719	1,732
Commercial, Industrial, and Agricultural [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	189	188
Allowance for loan losses, Collectively evaluated for impairment	4,473	5,115
Allowance for loan losses, Modified in a troubled debt restructuring	123	125
Acquired with deteriorated credit quality	4,785	5,428	5,627	6,035
Loans:
Loans individually evaluated for impairment	686	775
Loans collectively evaluated for impairment	584,252	564,180
Acquired with deteriorated credit quality	587,738	567,800
Loans modified in a troubled debt restructuring	2,595	2,640
Total ending loans balance	587,738	567,800
Commercial, Industrial, and Agricultural [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	205	205
Commercial Mortgages [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	1,548	996
Allowance for loan losses, Collectively evaluated for impairment	3,762	3,543
Allowance for loan losses, Modified in a troubled debt restructuring	2,047	2,214
Acquired with deteriorated credit quality	7,357	6,753	6,044	5,605
Loans:
Loans individually evaluated for impairment	6,171	6,176
Loans collectively evaluated for impairment	566,967	557,932
Acquired with deteriorated credit quality	583,653	574,826
Loans modified in a troubled debt restructuring	9,001	9,191
Total ending loans balance	583,653	574,826
Commercial Mortgages [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	1,514	1,527
Residential Real Estate [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	2,022	1,653
Allowance for loan losses, Modified in a troubled debt restructuring	0	0
Acquired with deteriorated credit quality	2,022	1,653	2,574	2,475
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	659,930	652,883
Loans modified in a troubled debt restructuring	0	0
Total ending loans balance	659,930	652,883
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	0	0
Consumer [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	2,089	2,215
Allowance for loan losses, Modified in a troubled debt restructuring	0	0
Acquired with deteriorated credit quality	2,089	2,215	2,274	2,371
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	74,187	74,816
Loans modified in a troubled debt restructuring	0	0
Total ending loans balance	74,187	74,816
Consumer [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	0	0
Credit Cards [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	105	93
Allowance for loan losses, Modified in a troubled debt restructuring	0	0
Acquired with deteriorated credit quality	105	93	81	90
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	6,076	6,046
Loans modified in a troubled debt restructuring	0	0
Total ending loans balance	6,076	6,046
Credit Cards [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	0	0
Overdrafts [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	188	188
Allowance for loan losses, Modified in a troubled debt restructuring	0	0
Acquired with deteriorated credit quality	188	188	$ 138	$ 161
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	591	595
Loans modified in a troubled debt restructuring	0	0
Total ending loans balance	591	595
Overdrafts [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	$ 0	$ 0

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Allowance for loan losses ending allowance balance attributable to loans.

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No definition available.

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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-Publisher FASB
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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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